Thanks for the advice.
What are you storing on your large RAIDS that you mention?
On Wed, Apr 10, 2013 at 12:35 PM, <m.roth@xxxxxxxxx> wrote:
> Jason T. Slack-Moehrle wrote:
> > Hi Mark,
> >
> > Do you override the automatic fsck check with tune2fs? It would be a huge
> > bummer to do through a check frequently, I forget the defaults but I
> think
> > 180 days or a certain number of mounts, iirc.
> >
> We do it manually, when we get to it, and when the users are going to be
> off long enough....
>
> Btw, I saw that you said you'd started on 1M - good move. I always start
> parted with -a optimal. I've read that non-optimal alignment can result in
> serious slowdowns in throughput - half as fast, or even slower.
>
> mark
> > Jason
> >
> >
> >
> > On Wed, Apr 10, 2013 at 11:39 AM, <m.roth@xxxxxxxxx> wrote:
> >
> >> Jason T. Slack-Moehrle wrote:
> >> >
> >> > I have a Drobo, connected to a CentOS 6.4 box. The box sees it as
> >> > /dev/sdg.
> >> >
> >> > I want to format it ext3 (as they dont support ext4) but when I try I
> >> get:
> >> <snip>
> >> > So I run:
> >> > # parted
> >> > GNU Parted 2.1
> >> > Using /dev/sda
> >> > Welcome to GNU Parted! Type 'help' to view a list of commands.
> >> > (parted) select /dev/sdg
> >> > Using /dev/sdg
> >> > (parted) print
> >> > Model: DROBO DroboPro (scsi)
> >> > Disk /dev/sdg: 17.6TB
> >> > Sector size (logical/physical): 512B/512B
> >> > Partition Table: gpt
> >> >
> >> > Number Start End Size File system Name Flags
> >> >
> >> > (parted)
> >> >
> >> > and looking at an example of creating a partition: (parted) mkpart
> >> primary
> >> > 106 16179
> >> >
> >> > I dont know what to do next since I dont see any partitions listed. I
> >> dont
> >> > know what do to for the start and end point, although the man page
> >> says
> >> > "size in MB". Do I just say 0 to (and convert 16.0TB to MB? Yes, I
> >> know
> >> it
> >> > says 17.6 TB but this model drobo can only support partitions up to
> >> 16tb
> >> > without making a second partition.
> >> >
> >> > Can anyone provide some advice on that I am missing conceptually?
> >>
> >> Several issues. First, if you use 4k blocks, the max filesystem size for
> >> ext3 is 16TB (see wikipedia on ext3). Second, I can't remember where,
> >> but
> >> on some filesystem tool's manpage, I read that the tools have problems
> >> going over 16TB. Third, fsck on a 16TB filesystem will take *days*,
> >> literally. I'm setting up, right now, a humongous RAID box, and I'll
> >> probably be divvying up the 42TB (mirrored!) as 3 14TB filesystems, and
> >> they're going to be ext4.
> >>
> >> mark
> >>
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>
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